The footage, which appears to have been taken in Emirates business class, shows a woman refilling a bottle.
It has been shared tens of thousands of times by outraged commenters – but insiders claim there could be an innocent explanation.
The airline has said it is investigating the footage.
Russian passenger Yevgeny Kayumov filmed it on the upper deck of an A380 while flying business class en route to Dubai.
Tagging Emirates on his Instagram...